MICROWAVE ABSORPTIVE BEHAVIOR OF NANOCRYSTALLINE Ba3Co1.3Zn0.3Cu0.4Fe24O41 POWDER

被引：0

作者：

Caffarena, V. R. ^{[1
]}

Ogasawara, T. ^{[2
]}

Capitaneo, J. L. ^{[3
]}

Pinho, M. Silveira ^{[4
]}

机构：

[1] Petr Brasileiro SA Gas&Power, BR-20031004 Rio De Janeiro, Brazil

[2] UFRJ, COPPE, PEMM, Dept Met & Mat Engn,Ilha Fundao, BR-21945970 Rio De Janeiro, Brazil

[3] Ilha Fundao, Inst Macromol Prof Eloisa Mano, BR-21945970 Rio De Janeiro, Brazil

[4] IPqM, Brazilian Navy Res Inst, BR-21931090 Rio De Janeiro, Brazil

来源：

LATIN AMERICAN APPLIED RESEARCH | 2008年 / 38卷 / 03期

关键词：

Z-type hexaferrite; RAM; magnetic properties; sol-gel synthesis;

D O I：

暂无

中图分类号：

TQ [化学工业];

学科分类号：

0817 ;

摘要：

In the present work, Cu2+ and Zn2+ ions were incorporated into the structure of Ba3Co2Fe24O41, in order to obtain the Ba3Co1.3Zn0.3Cu0.4Fe24O41 structure, by the sol-gel precursor method in N-2 inert atmosphere. The magnetization curves of Ba3Co1.3Zn0.3Cu0.4Fe24O41 hexaferrite nanopowders were analyzed as a function of temperature, to evaluate the superparamagnetic (SPM) behavior and its effect on the microwave absorption measurements. The permittivity (epsilon) and permeability (mu) values were obtained by using the transmission/reflection (T/R) method in a waveguide to evaluate the microwave absorption properties at S and X-Ku bands, for radar absorber material (RAM) application. The partial substitution of Co for Zn and Cu ions and the superparamagnetic contribution improved the ceramics' magnetic permeability, resulting in a microwave absorption greater than 90.0% (reflectivity <= -10 dB) at 10.0-12.5 GHz and 13.0-16.0 GHz, with 2.5 and 2.0 mm thick, respectively.

引用

页码：235 / 239

页数：5

共 8 条

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